Work driver for lathes



Oct. 8, 1929.

J. D. S LYDER WORK DRIVER FOR LATHias Filed April 8, 1925 Patented Oct. 8, 1929 UNITED STATES:

PATENT OFFICE won]: DRIVER FOR LATHES Application filed April 8,

This invention relates to machines for trueing brake drums of automobile wheels and the like, and is applicable to that type of machine disclosed in United States Letters Patent No. 1,554,302, issued September 22, 1925, to Jesse D. Slyder and Charles R. McMinn,

on which brake drums are trued without removal from their wheels. a

The primary object of the invention is to provide such a machine which shall be rehdily adapted for receiving wheel hubs of. various sizes for the purpose of presenting the drums of the wheels to the drum-trueing tool. Another object is to firmly secure on the machine wheel-hubs which vary from standard size due to wear. i

A further object is to increase the range of work that may be performed on a single machine, and'eliminate the necessity of provi 'ng a large number of machines to care for the usual large variety of sizes of hubs.

These objects are accomplished in one form of the present ihvention byproviding the driven shaft of the machine withmeans for. removably mounting thereon arbors or mandrelspf varying sizes'adapted to receive hubs of wheels for presentation of the drums thereon to the trueing tool while still attached to the wheels. In addition to providing the interchangeable feature, variously sized sleeves or shims, which may conveniently be split, are employed,- these being adapted to be placed upon the mandrels to care for small variationsin size particularly those due to wear. a

The invention resides in the novel-combination and arrangement of parts and in the features of construction disclosed in certain forms in the accompanying drawings, described generally and pointed out in the claims, it'being understood that the inven tion is limited onlyas defined by the claims.

In the drawings, wherein certain embodiments of the invention are shown by way of illustration- Figure 1 is a longitudinal section through a mandrel of the present invention with a wheel hub in operative position thereon;

Figure 2 is a cross section on the line 22 of Figure 1;

1925. Serial No. 21,574.

Figure 3 is a perspective view of one of the T removable mandrels;

Figure 4 is a perspective view of a split sleeve or shim adapted to be employed upon amandrel;

Figure 5 is a perspective view showing an automobile wheel in operative position on the device with the drumof the wheel presented to the trueingtool; and

' Figure 6 is a longitudinal section indicating a modified form of filler nut which may be employed where the wheel hub is short.

In carrying out the present invention I provide an independent tapered mandrel 16 adapted to be passed through the hubH of a vehicle wheel, .which mandrel is designed to be removably carried upon a driven shaft 10 'mounted in one or more bearings 12 supported by a base 14. For the purpose of detachably receiving the mandrel, the end of the shaft :10 is provided with a head 15' externally thread- .ed as shown, this head constituting in effect a live stock for. driving the mandrel 16, the latter being secured to said head 15 by means i of a nut 18, internally threaded at 20 toen- 7 gage said threaded head and having an inturned flange 22 for engagement with the back of an enlarged head 24 formed on the inner end of the' mandrel. The head 15 is provided with a tapered boss 25 adapted to enter a recess 26 formed on the enner end of 'the mandrel 16 for the purpose of centering.

the parts and positioning the mandrel in axial alignment with the shaft. For the purpose of holding the mandrel against turning relatively to the shaft the head 15 is provided with a stud 28 which enters a notch 30 in the mandrel head 24. If desired, the periphery of the nut 18 may be fluted, as at 32, to insure firm engagement by a tool or by ones hand .36 adapted to pass over the end of the mandrel 16 to engage the end of a short hub. The outer end portion of the mandrel 16 is formed with a smooth cylindrical projection extending beyond the threaded portion 34 for rotary engagement in a positioning yoke 42 carried on a standard 43 provided .with a base 44 which is adapted to be adjustably moved between guides 45 on a rigidly positioned support 46. The base '44 is adapted .to be secured in adjusted position by means of a s'et'screw or the like 48. Thus the standard 43 serves as a-tail stock to position the outer end of the mandrel 16 especially if said mandrel is unusually long.

From the foregoing it will be apparent that mandrels 16,0f various sizes may be readily interchanged upon the driven shaft 10, merely by removal of the nut 18, so that a great variety of sizes of wheel hubs may be positioned for rapid work of the tool T upon the-brake drums D of said wheels.

as indicated, a considerable number of different sizes of hubs maybe accommodated by a single mandrel by reason of the fact that a smaller hub will be positioned nearer the outer end of the'mandrel 16 and be held by the filler sleeve 36 while somewhat larger hubs.

will be positioned farther up on the mandrel 16 and be engaged by the filler sleeve 36'. Other variations may be cared for on the same mandrelby employment of split sleeves or shims 50, as indicated in Figure 4, these being provided in several sizes.

Thus by providing a number of mandrels 16 of various sizes, one drum-trueing machine will take care of all of the wide range of work coming into'the shop, and the work ma be turnedout with considerabledispatch.

y the use of this invention trueing of brake drums of vehicle. wheels may be readily effected without removing the brake drum from the wheel or wheel hub on' which it is mounted, as the mandrel 16'afi'ords an effective means for engaging the hub of the 'vehicle wheel in such manner that the wheel will be supported and rotated in the brake drum trueing machine in substantially the same manner as it is supported on the vehicle axle or wheel spindle. This is advantageous as it effects a saving oftime and-labor over the present general practice of dismounting the rake drum as where the latter is trued on an ordinary lathe, and as it also insures trueing of the brake drum in proper relation to the axis of the wheel on which it is carried. Securing of the'mandr'el to the rotary shaft 10 is facilitated by reason of the nut 32 formin a part of the mandrel yet being turnable re atively thereto as by bringing the nut into engagement with the threaded head of the shaft 10 while the latter is rotating and holding the nut stationary, the mandrel may be very quickly applied to the shaft.

Furthermore, by providing a wheel-carrying mandrel adapted to extend through a wheel hub, together with means for clamping the hub on the mandrel, as contemplated by. my invention, a substantial support is afforded the wheel during the drum trueing operation, and also quick mounting and demounting of the wheel on the brake drum trueing machine may be accomplished.

While I have shown and described a specific embodiment of my invention, it-is to be understood that it embraces other forms that come within the scope of the appended claims, for example, the mandrel may have any desired shape according to the type of vehicle wheel and hub to be carried thereon.

I claim 1. A machine for truing brake drums on vehicle wheels comprising a base, a bearing supported by the base, a shaft rotatably.

mounted in the-bearing, an externally threaded head formed on the shaft, an independent mandrelfor insertion through a wheel hub, ahead on said mandrel, and internally threaded nut encircling said mandrel, and an in-' turned flange on said nut arranged to seat on the mandrel head, said nut being screwable on the threaded head of said shaft for detachably securing the heads of the shaft and mandrel.

2. In a machine for truing a brake drum on a vehicle wheel, a revoluble shaft, an independent mandrel formed to pass through the hub of a vehicle wheel and eflt'ect'wedge engaged-therewith, means for detachably connecting the inner end of -said mandrel to saidshaft, and means on the outer end ofsaid mandrel for hearing against the hub of a vehiclewheel positioned'on the mandrel and operable to force the hub into wedge engagethereon.

i 3. Ina machine for truing a brake drum on a vehicle wheel, the structure specified in claim 2 including a cylindrical extension on the outer end of the mandrel, and a standard on' which said extension seats. I

4. In'a machine for truing brake drums on a vehicle wheel, a revoluble shaft, an independentv tapered mandrel formed to pass through the hub of a vehicle Wheel, means for detachably connecting the inner end of the said mandrel to the shaft, a reduced threaded projection on theouterend of said mandrel, and a nut screwed on said projection operable to force the hub into wedge engagement with 

